Accessing NumericalData/Parameter/CoordinateSystem elements

[BaptisteCecconi]

I tried to access the content of CoordinateSystem nodes, and more especially looking for the has_coordinate_system_name property.

As far as I can see in the result of the following query:

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX spase: <http://www.spase-group.org/data/schema/>

SELECT ?coosys ?coosysp ?coosyso WHERE {
   ?subj a spase:NumericalData .
   ?subj spase:has_instrument <http://www.spase-group.org/data/schema/SMWG_Instrument_Wind_MFI> .
   ?subj spase:has_temporal_description ?timedescr . 
   ?timedescr spase:cadence ?cadence  .
   ?subj spase:has_measurement_type <http://www.spase-group.org/data/schema/MAGNETIC_FIELD> .
   ?subj spase:has_parameter ?param . 
   ?param spase:has_coordinate_system ?coosys .
   ?coosys ?coosysp ?coosyso .
}

I only get rdf:type and rdfs:label properties in the list of results. The other items (which are present in the XML records) are not present. I had a look to the SPASE to RDF converter, but couldn't figure out how to fix this.